Method of making molds.



' Cmethods of making'mold's, and consistsln a method of. manufacture -which "produces To all whom i m m niirriu'nl's. BEE RQ KfNoXvInLn, rnni svnveiiie;

-I vBe it known that IfARTI-IURlSI REEDERQ residingatKnoxvillmin the county'of Allegheny and State of- Pennsylvania, Ta 7 citizen of the United States, have invented or,

v discovered a certain new and useful Improvement in'Methods of Making Molds,

of which improvementl thei following is a- 1 specification; I

My 'nvention'relates to. improvements in 'molds for glass articles "of superior character and quality. I 'The' molds in Which articles of glassware such, 'as tumblers; bottles, jars, etaare" pressed or blown areformed of cast iron.

Ordinarily these molds are-tvvo-p'art molds, hinged together, so that; the articles when formed in them may the more readily be removed. In some casesthe bottoms ofthe.

molds are made as separate parts. Such molds are made in a considerable rangeof sizes; the mold cavities are of all sorts of shapes; and the'thickness of the .mold walls is in many molds very unequal in-different parts; and not infrequently the'inner fa ces of'the mold cavities are cutaway irregularly to produce patternsof: ornament and use in thefinished article.

In the use of molds for The cast-1 ished and prepared for service by being machined to the true shape. and size. desired.

I In use, these molds, very irregular. in shape 1 V andin the'distribution of the metal of which they are formed, and subjected tohigh and" *fluctuating temperature, often localized and I the 'accurateshape, initially givenfthem they [become Warped anddistorted, and produce.

concentrated atsome particularflpoint, lose imperfect articles Whensuch misshaping 5,5 2. apart and worked over with 3 a filefor other I advances beyond the *point'fof, producing" passable articles the mold imust I be taken y Specification of Letters Pateiitl I of. the mold to warp while inv service, and

this ismy invention': Thev mold,-.after it has i been cast and bGfOIG'lt is machined, is subpressing glass a' mass of hot glass (which, when melted is at. .a'temperature of about 220Q F.)'is dropped ,into the mold andspread by a plunger, which constitutes-the other mold part; in i the use of 'iblownsglass molds ahot body of glass is suspended in the mold-icavity and blown into contact with the mold walls. In fcertain machines the" articles are' formed in .the molds partly by'pressing and partly? I i Y f f flufacture, isn'ot liable'to'suchdistortion and ron mold itself is a green-sand casting, and,*when it has been cast it is fin- -nary manufacture experiencesyit is far'more'l I J ar n eme-wees- Patented Janie, 1 916;;

.1we i aummeea ust17, eia 'fs riaiN 15,949. ap-Adz; I

'instr.ument,tand its deviations in shape must .be'corrected, so far. as possible.- :Of. course,

sujch deviationsin shape'are undesirable and economlcally OblGCtlOIlablG, and'such work of correcting faults istime-consuminggex- -PBIlSlVG, and wholly 'undeslrablea Further. 3

more, beyondfa'certain amount,:thefideparshape w'ill render it unfit for service;

-' My invention resides 'in 'introducing. into I A -the'method of manufacture of the-mold itself .aste'pwhich has theelfect ofcuri'ngor pre-.

venting the liability which I have described jected to'a heat treatment. 'It is taken from.

' the-sand in Whichit has been. formed "(either immediately, or' at. such ,time as is co'nvenient) and placed in ;the chamber' of a 'heat-- ing furnace. Its temperatureis the'regrad I ually-raisedtoa point where,v thermal ex stanti'ally that degree" for j considerable time, preferably about eight hours. "'T he fire "pansion isarrested and as I believeinternal strains relieved; this occurswhen the article has reached a bright red heat, at a tempera- 5 ture of about 14001450 F. and when j I raised tosuch a degree is maintained at sub j I in the furnaceisithen extinguished and the.

substantially to atmospheric temperature. This heat treatment just described is preferably, though not necessarilyfrepeated a second,'andit maybe repeated even a thi'rd is taken andma'chined in the usual manner 1n preparatlon'; for 1ts; lntended use. Such mold Within allowed C001 r dually to. '0'1' time. .When the mold .hasjbeen subjected to thisheat. treatment andis'cool again, it

a mold, s0 treated in the course of its manmisshap'ing. in'.;servic e,, as the mold of-ordi-.

durable, 'farzless costly inJmaintenance, and produces .uniformly's'atisfactory v articles. I I

In some cases it'will be; found desirable Ito'taketh'e moldinitsini'tialcondition after i [being-cast, and first heat it and:then suddenlyi cool' or quench it, and thereafter sub "je'ct ittothe, gradually increased and graduv uall'y diminished temperature treatment whichiI have describedv above, repeated if. desired. Such a preliminary j -heating; and; 1- I I f rand -improves"its ltexturefor} the purpose) intended. I Ofroourse myimethod in thisfand,

quenching operation vcon's'ol idates" the metal in other respects does not exclude the. adop tion and use at the same time of such other ment require, or the Wisdom and 6X7 perience of the operator may suggest.

I claim as my invention:

1. The method herein described or making cast iron molds which consists in casting the mold, subjecting the mold when cast to a strain-relieving temperature, gradtrallyattained and gradually diminished, and finally, after it has been so formed and treated, shaping the mold minutely for its intended use,

2. The method herein described of making cast-iron molds which consists in casting the mold, subjecting the mold repeatedly Gopies ofthis patent may be obtained for when cast to a strain-relieving temperature gradually attained and gradually diminished, and finally, after it has been so formed and treated, shaping the mold minutely for its intended use.

finally, after it has beenso treated, shaping the mold minutely for its intended use.

In testimony whereof I have hereunto set v ARTHUR'S. REEDER. Witnesses: BAYARD H. -CHRISTY,

Geo, B. BLEMING.

five cents eacly'by addressing the Commissioner of Patents,

Washington, D; C. Y 

